Malicious PDF — malware analysis report

Static analysis result for SHA-256 58102ba588b76263…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 05:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fc90d949b5127408e88da202718c4fb SHA-1: fa954e4f9d016eafd5488177a279b258b088f593 SHA-256: 58102ba588b76263c6c670fca921b56bdc3f1d3da6d22dcdadfbc7bc47e8a017
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to trick the user into downloading a payload. The embedded JavaScript likely facilitates the download or execution of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://shyjjc.com/v15/Upload/file/2021991249159121.pdf In PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/varawogiwefedivegaj.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/fogatebotajowawe.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/joreg.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/75707271093.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/356ff46dfa9e9904c7f650a32bf945b7/kepodozixinerun.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/sosogigazujudotom.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210912003736.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vivamob.pdfIn PDF document text
    • http://fedime.org/imagenes/rogipirilurumalowedo.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tunajorogezutuniletefad.pdfIn PDF document text
    • https://majubesar.com/contents/files/wunokajurujovafojakom.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/zipipodanokun.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7556528a577491b925bb8b1c8cdbc9e3/zaxirubeludupidavoz.pdfIn PDF document text
    • http://nemochem.cn/upload/files/mefojilurokivunanunugoku.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467a73f07f---6609854982.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/penipogavopukemoziba.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/tikesexef.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6cef8c982610f6eb3184c04904e1352a/56686185005.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/70091857382.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/gizejuxisegu.pdfIn PDF document text
    • http://sinoorchids.com/image/file/nibavorarixononezupe.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/95748655795.pdfIn PDF document text
    • https://datenglagi.com/contents/files/67998307832.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/rakimekejutasi.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/tamixoleriwulafidaguwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=galaxy+infinity+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 10608 bytes
SHA-256: 7372bb7fe95fad2fe56308eb9cc458cd5e3220c32d597e2fdcbded62040fd710
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 17280 bytes
SHA-256: e35aaed901b726af2a0256b5ac306c70641e21044b44e087826f958bec8669f0
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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